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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\XMLSecurity\Alg\KeyTransport; |
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use SimpleSAML\Assert\Assert; |
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use SimpleSAML\XMLSecurity\Alg\Encryption\EncryptionAlgorithmInterface; |
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use SimpleSAML\XMLSecurity\Backend\EncryptionBackend; |
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use SimpleSAML\XMLSecurity\Exception\RuntimeException; |
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use SimpleSAML\XMLSecurity\Key\AbstractKey; |
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/** |
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* An abstract class that implements a generic key transport algorithm. |
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* |
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* @package simplesamlphp/xml-security |
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*/ |
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abstract class AbstractKeyTransporter implements EncryptionAlgorithmInterface |
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{ |
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/** @var \SimpleSAML\XMLSecurity\Key\AbstractKey */ |
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private AbstractKey $key; |
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/** @var \SimpleSAML\XMLSecurity\Backend\EncryptionBackend */ |
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protected EncryptionBackend $backend; |
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/** @var string */ |
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protected string $default_backend; |
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/** @var string */ |
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protected string $algId; |
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/** |
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* Build a key transport algorithm. |
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* |
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* Extend this class to implement your own key transporters. |
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* |
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* WARNING: remember to adjust the type of the key to the one that works with your algorithm! |
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* |
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* @param \SimpleSAML\XMLSecurity\Key\AbstractKey $key The encryption key. |
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* @param string $algId The identifier of this algorithm. |
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*/ |
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public function __construct(AbstractKey $key, string $algId) |
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{ |
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Assert::oneOf( |
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$algId, |
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static::getSupportedAlgorithms(), |
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'Unsupported algorithm for ' . static::class, |
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RuntimeException::class |
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); |
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$this->key = $key; |
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$this->algId = $algId; |
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$this->setBackend(new $this->default_backend()); |
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} |
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/** |
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* @return string |
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*/ |
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public function getAlgorithmId(): string |
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{ |
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return $this->algId; |
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} |
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/** |
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* @return AbstractKey |
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*/ |
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public function getKey(): AbstractKey |
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{ |
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return $this->key; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function setBackend(?EncryptionBackend $backend): void |
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{ |
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if ($backend === null) { |
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return; |
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} |
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$this->backend = $backend; |
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$this->backend->setCipher($this->algId); |
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} |
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/** |
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* Encrypt a given key with this cipher and the loaded key. |
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* |
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* @param string $key The original key to encrypt. |
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* |
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* @return string The encrypted key (ciphertext). |
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*/ |
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public function encrypt(string $key): string |
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{ |
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return $this->backend->encrypt($this->key, $key); |
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} |
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/** |
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* Decrypt a given key with this cipher and the loaded key. |
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* |
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* @note The class of the returned key will depend on the algorithm it is going to be used for. |
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* |
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* @param string $key The encrypted key. |
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* |
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* @return string The decrypted key. |
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*/ |
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public function decrypt(string $key): string |
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{ |
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return $this->backend->decrypt($this->key, $key); |
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} |
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} |
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simplesamlphp /
xml-security
